OJ-Problems-Source/HDOJ/2266_autoAC.cpp

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#include <iostream>
#include <cstdlib>
#include <cstring>
using namespace std;
__int64 sum,ji;
void dfs(char s[],__int64 now,int ci)
{
int i,j,len;
char str[15];
len=strlen(s);
if(len == 0)
{
if(now == sum)ji++;
return ;
}
if(ci == 0)
{
for(i=0;i<len;i++)
{
for(j=0;j<=i;j++)
{
str[j]=s[j];
}
str[j]=0;
dfs(s+i+1,(__int64)atoi(str),ci+1);
}
}
else
{
for(i=0;i<len;i++)
{
for(j=0;j<=i;j++)
{
str[j]=s[j];
}
str[j]=0;
dfs(s+1+i,now+atoi(str),ci+1);
dfs(s+1+i,now-atoi(str),ci+1);
}
}
}
int main()
{
int i,j;
char s[15];
memset(s,0,sizeof(s));
while(~scanf("%s %I64d",s,&sum))
{
ji=0;
dfs(s,0,0);
printf("%I64d\n",ji);
memset(s,0,sizeof(s));
}
return 0;
}